Supporting spring assembly for seats



May 28, 1963 c. s. REED 3,091,451

SUPPORTING SPRING ASSEMBLY FOR SEATS Filed May 51, 1962 6 Sheets-Sheet 1 "a cL Aff? s. @50

TTOR/VA'YS c. s. REED 3,091,451

SUPPORTING SPRING ASSEMBLY FOR SEATS 6 Sheets-Sheet. 2

May 28, 1963 Filed may s1, 1962 May 28, 1963 3,091,451

C. S. REED SUPPORTING SPRING ASSEMBLY FOR SEATS Filed May 5l, 1962 6 Sheets-Sheet 3 Res INVENTOR.

cz. A/A o" R550 BY ATTORNEYS May 28, 1963 c. s. REED SUPPORTING SPRING ASSEMBLY FOR SEATS 6 Sheets-Sheet 4 Filed May 3l, 1962 C. S. REED SUPPORTING SPRING ASSEMBLY FOR SEATS May 28, 1963 Flled May 3l, 1962 May 28, 1963 c. s. REED SUPPORTING SPRING ASSEMBLY FOR SEATS 6 Sheets-Sheet 6 Filed May 51, 1962 o o Quan IN VEN TOR. C/9/? 6. Rif@ l BY x @Knauf /au dA-y,

ATTORNEY@ United States Patent O 3,091,451 SUPPORTING SPRING ASSEMBLY FOR SEATS Clair S. Reed, Wayne, Mich., assignor to Van Dresser Specialty Corporation, Warren, Mich., a corporation of Michigan Filed May 31, 1962, Ser. No. 198,955 2l) Claims. (Cl. 267-102) This invention relates generally to upholstered spring structures, and refers more particularly to an improved supporting spring assembly for seats.

One of the essential objects of the invention is to provide an improved supporting spring assembly wherein two spring wire reinforced composite layers arranged in superimposed relation have been substituted for the usual separate wire reinforced fabric insulators and their separate wire or spring supports.

Another object is to provide an improved supporting spring assembly wherein the lower of said two layers is provided throughout its length at the front longitudinal edge thereof with a preformed open return bent portion that is secured to the upper layer and provides a yieldable support for the front longitudinal edge of the upper layer.

Another object is to provide an improved supporting spring `assembly wherein suitable means are provided along the front of the lower layer and along the rear longitudinal edges of the superimposed layers for anchoring such layers to ya supporting frame.

Another object is to provide an improved supporting spring assembly wherein each layer includes longitudinally 9 extending border wires and transversely extending remforcing wires, the latter being threaded through fabric in either sheet or strip form and being terminally connected to the border wires.

Another object is to provide an improved supporting spring assembly wherein the upper of the two composite layers is preferably arched upwardly throughout its length to serve as a support for the upholstery, such as the usual felt or cotton layer, sponge rubber layer, and exterior trim material of the seat.

Another object is to provide an improved supporting spring assembly wherein the lower layer is preferably arched upwardly throughout its length toward and serves as a booster for the upper layer to provide the latter with a spring support when subjected to compression and to provide a soft cushioning movement for the upper layer.

Another object is to provide an improved supporting spring assembly wherein the lower booster layer may be either secured or in spaced relation to the upper layer.

Another object is to provide an improved supporting spring assembly wherein a complete support is provided for the upper layer throughout its length and wherein a better cushioning effect is provided at individual points of the upper layer, especially at the front edge thereof.

Another object is to provide an improved supporting spring assembly which has been simplified by reducing the over-all number of indivdual parts or elements thereof, and which therefore requires less labor and expense to manufacture.

Other objects, advantages and novel details of construction of this invention will be made more apparent as this description proceeds, especially when considered in connection with the accompanying drawings wherein:

FIGURE 1 is a perspective view of an upholstered assembly provided with a spring structure embodying my invention, and showing parts broken away and in section.

FIGURE 2 is a fragmentary top plan view of a supporting frame for the spring structure.

FIGURE 3 is an end view of a spring structure embodying my invention and of a supporting frame therefor.

FIGURE 4 is a top plan view of the structure illustrated in FIGURE 3.

ICC

FIGURE 5 is a top plan view of the upper layer before being applied to the supporting frame therefor.

FIGURE 6 is a top plan view of the lower layer before being applied to the supporting frame therefor.

FIGURE 7 is `an end view of a slightly modified structure wherein the arched portions of the upper and lower layers are spaced apart.

FIGURE 8 is an end view of another modification.

FIGURE 9 is a top plan view of the lower layer shown in FIGURE 8.

FIGURE l() is an end view of another modification.

FIGURE il is a top plan view of the structure shown in FIGURE l0.

FiGURE l2 is an end view of another modification.

FIGURE I3 is a top plan view of the structure illusstrated in FIGURE 12.

FIGURE 14 is an end view of another modification.

FIGURE l5 is a top plan view of the structure illustrated in FIGURE 14.

Referring now to the drawings, 10 is a supporting frame having laterally spaced front and rear longitudinally extending members 11 and 12 respectively and having longitudinally spaced transversely extending members 13 and 14 respectively extending between and secured to said longitudinally extending members 11 and 12 at opposite ends thereof.

Preferably the longitudinally extending rear member 12 is hollow and is substantially rectangular shape in cross section. The outer side wall 15 of said longitudinally extending member 12 is secured in surface-tosurface relation to the end wall 16 of the transversely extending member 13, while the bottom wall 17 of said longitudinally extending member 12 is ilat and extends inwardly from the outer side wall 15 thereof beneath the inner side wall 18 thereof. Such flat bottom wall 17 has a flat extension 19 that projects laterally inward beyond the inner side wall 18 and that is provided adjacent its inner edge with longitudinally spaced openings 20. The inner side wall 18 of said longitudinally extending member 12 has an inwardly extending lateral flange 21 that rests upon and is secured to the inward extension 19. The front longitudinally extending member 11 is inverted U-shape in cross section and opens toward the bottom 22 of the transversely extending member 13. Preferably the outer side wall 23 of said front longitudinally extending member 11 is secured in surface-to-surface relation to the end wall 24 of the transversely extending member 11, while the inner side wall 25 of said longitudinally extending member 11 has an inwardly extending lateral ange 26 that rests upon and is secured to the bottom 22 of the transversely extending member 13.

27 and 28 respectively are two spring wire reinforced composite layers arranged in superimposed relation and extending longitudinally of and anchored to the supporting frame 10 at the front and rear thereof for supporting the usual upholstery of the seat.

Preferably the upper layer 27 comprises a substantially rectangular sheet 29 of fabric, a substantially rectangular border frame 30 upon one side of and centered relative to said sheet, and longitudinally spaced transversely extending reinforcing wires 31 threaded through the sheet 29 and terminally connected to opposite longitudinally extending sides 32 and 33 respectively of the border frame.

The sheet 29 of fabric may be burlap or any other suitable sheet material. The border frame 30 is preferably covered or wrapped with paper 34 and may be any desired shape and of any gauge steel to provide the proper strength. The reinforcing wires 3l may be helical, spiral, sinuous, or straight as desired, and of any gauge spring steel or other suitable material consistent with resiliency and the strength required to serve as spring supports. Such reinforcing wires 31 may be spaced longitudinally apart as desired and may be light gauge at opposite ends any heavy gauge at the center of the fabric sheet 29, or vice versa, depending upon the requirements.

The lower layer 28 comprises a substantially rectangular sheet 35 of fabric, two separate transversely spaced longitudinally extending front and rear border wires 36 and 37 respectively upon one side of and centered relative to said sheet 35, and longitudinally spaced transversely exending reinforcing wires 38 threaded through the sheet 35 and terminally connected to said border wires 36 and 37. Preferably an upwardly projecting inwardly opening preformed open return bent portion 39 extends throughout the length of the lower layer at the front thereof. The sheet 35 of fabric may be burlap or any other suitable material, and holds the spaced reinforcing wires 38 in proper spaced relation to each other and to the front and rear border wires 36 and 37. The two separate longitudinally extending border wires 36 and 37 may be covered or wrapped with paper 36' and may be any desired shape and of any gauge spring steel or other suitable material to provide the proper strength. The reinforcing wires 38 may be helical, spiral, sinuous, or straight, as desired, and of any gauge spring steel consistent with resiliency and the strength required to serve as spring supports. Such reinforcing wires 38 may be spaced longitudinally apart as desired and may be light gauge at opposite ends and heavy gauge at the center of the fabric sheet 3S, or vice versa, depending upon the requirements.

The rear longitudinally extending border wire 40 of the lower layer 28 is secured throughout its length to the flat inward extension 19 of the rear longitudinally extending member 12 by clips 41 or other suitable means that embrace such border wire 40- and that extend through the openings in said extension 19.

After the rear border wire 40 of the lower layer 28 has been secured to the flat inward extension 19 of the rear longitudinally extending member 12, the lower layer 28 is then bent or arched upwardly, and then is secured throughout its length adjacent the preformed open return bent portion 39 by clips 42 or other suitable means to the front longitudinally extending member 11.

The rear longitudinally extending side 33 of the border frame of the upper layer 27 is anchored throughout its length in longitudinally aligned substantially U-shaped arms 43 that are struck out from and that open toward the inner upright side wall 18 of the longitudinally extending member 12. The rear longitudinally extending side 33 of the border frame 30 is received in such U-shaped arms 43 when the latter are struck out from the inner upright side wall 18 of the longitudinally extending member 12 and are anchored in said arms 43 when the latter are pressed toward the inner upright side wall 18 of the rear 1ongitudinally extending member l2. The upper layer 27 is then bent or arched upwardly over the lower layer including the preformed open return bent portion 39 thereof, and then is secured throughout its length in spaced relation to the front longitudinally extending side 32 of the border frame 30 of said upper layer by hog rings 44 or other suitable means to the front border wire 36 of the preformed open return bent portion 39 of the lower layer. Thus this open return bent portion 39 forms a yieldable support and a better cushioning effect for the front longitudinal edge of the upper layer.

Preferably the arched portions 45 and 46 respectively of the upper and lower layers 27 and 28 are secured together by adhesive 47 adjacent the longitudinal median line thereof but may be secured together by any other suitable means, such as hog rings, clips, staples and the like.

Vertical coil springs 48 and 49 respectively extend between and are terminally anchored to the transversely extending end members 13 and 14 respectively of the supporting frame l0 and t0 the lower layer 28 intermediate the front and rear thereof to support the superimposed layers 27 and 28 at opposite ends of the supporting frame 10.

The arched portion 46 of the lower layer 28 serves as a booster for the arched portion of the upper layer 27 of provide such upper layer with a spring support when subjected to compression and to provide a soft cushioning movement for the upper layer. The arched portion 46 of the lower layer 28 causes the arched portion 45 of the upper layer 27 to return to its original arched position after the latter has been relieved of a load.

In FIGURE 7, I have shown a slight modification wherein the arched portions 50 and 51 respectively of the upper and lower layers 52 and 53 are spaced apart, so that the arched portion 50l of the upper layer 52 may have a limited downward movement before the arched portion 51 of the lower layer 53 serves as a booster therefor. Otherwise the construction in FIGURE 7 is the same as in FIGURES l to 6 inclusive.

In FIGURES 8 and 9, I have shown another modification wherein the lower layer 5-4 comprises three laterally spaced longitudinally extending strips 55, 56 and 57 respectively of fabric, such as burlap, or any other suitable material, two separate longitudinally extending border wires S8 and 59 respectively extending lengthwise of the outermost strips 55 and 57, and longitudinally spaced transversely extending reinforcing wires threaded through the strips 55, 56 and 57 respectively and terminally connected to the border wires 58 and 59. This lower layer 54 has been substituted for the lower layer 28 to serve as a booster for an upper layer 6l correspond` ing to the upper layer 27.

In FIGURES 10 and 11, I have shown another modification wherein the lower layer 62 is provided throughout its length at `the front thereof with. two preformed open return bent portions 63 and 64 respectively. Preferably the preformed open return bent portion 63 opens inwardly, while the preformed open return bent portion 64 opens outwardly. As shown, the lower side 65 of said preformed return bent portion 64 is connected to the outer side 66 of the preformed open return bent portion 63, while the inner side 67 of the preformed open return bent portion 63 connects edgewise into the lower layer 62.

The rear longitudinally extending border wire 68 of the lower layer 62 is secured throughout its length to the flat rearward extension 69 of the rear longitudinally extending member 70 by clips 71 or other suitable means that embrace such border Wire 68 yand that extend through the openings 72 in the extension 69.

After the rear border wire 68 of the lower layer 62 has been secured to the flat inward extension 69 of the rear longitudinally extending member 70, the lower layer 62 is then bent or arched upwardly so that the outer si-de 66 of the preformed open return bent portion 63 may be secured by clips 73 to the inner side wall 74 of the front longitudinally extending member 75.

The rear longitudinally extending side 76 of the border frame 77 of the upper layer 78 is anchored throughout its length in longitudinally aligned substantially U-shaped arms 79 that are struck out from and that open toward `the inner upright side wall 80 of the longitudinally extending member 70. The upper layer 78 is then bent y or arched upwardly over the lower layer 62, including the preformed open return bent portions 63 and 64 thereof, and then the front longitudinal side 81 of the border frame of the upper layer 78 is secured throughout its length by clips 82 or other suitable means to the front border wire 83 of the preformed open return bent portion 64 of the lower layer 62. Thus the open return bent portion 64 of the lower layer 62 forms a yieldable support and a better cushioning effect for the front longitudinal edge of the upper layer 78.

Preferably the arched portions 84 and 85 respectively of the upper and lower layers 78 and 62 are secured together by adhesive 86 adjacent the longitudinal median line thereof, but may be secured together by any other suitable means such as hog rings, clips, staples and the like.

Vertical coil springs 87 and 88 respectively extend between and are terminally anchored to the transversely extending end members 89 and 90 respectively of the supporting trame 91 and tto the lower layer 62 intermediate the front and rear thereof to support the superimposed layers 62 and 78 at opposite ends of the supporting `fratrie 91.

fIn FIGURES 12 and 13, I have shown another modification wherein the lower layer 92 is provided throughout the length of the front longitudinal edge thereof with two preformed open return bent portions 93 and 94 respectively that open inwardly. As shown, the lower side 95 of the return bent portion 94 is connected to the outer side 96 of the open return bent portion 93, while the inner side 97 of the preformed open return bent portion 93 connects edgewise into the lower layer 92.

The rear longitudinally extending border wire 98 of the lower layer 92 is secured through-out its length to the tlat inward extension 99 of the rear longitudinally extending member 100 by clips 101 or other suitable means that embrace such border wire 98 and that extend through openings 102 in the extension 99.

After the rear border wire 98 of the lower layer 92 has been secured to the llat inward extension 99 of the rear longitudinally extending member 100, the lower layer 92 is then bent or arched upwardly so that the bottom 103 of the preformed open return bent portion 93 may be engaged with and secured by clips 104 -to upper and lower inwardly extending horizontal flanges 105 and 106 respectively of the front longitudinally extending member 107. Such clips 104 embrace a longitudinally extending wire 108 on the bottom 103 `of the preformed open return bent portion 93, and extend through registering openings 109 and 110 respectively in the upper and lower inwardly extending horizontal ilanges 105 and 106 of the front longitudinally extending member 107.

The rear longitudinally extending side 111 of the border fram-e 112 of the upper layer 113 is anchored throughout its length in longitudinally aligned substantially U-shaped arms 114 that are struck out from and that open toward the inner upright side wall 115 of the rear longitudinally extending member 100. The upper laye-r 113 is then bent or arched upwardly over the lower layer 92, including the preformed open return bent portions 93 and 94 thereof, and lthen is secured throughout its length in spaced relation to the front longitudinally extending side 116 of the border frame 112 of said upper layer 113 by hog rings 117 or other suitable means to the front border wire 118 of the preformed open return bent portion 94 of the lower layer 92. lf desired, additional hog rings 119 may be used in spaced relation to the hog rings 118 to secure the upper layer 113 to the upper side 120 of the preformed open return bent portion 94. Thus this open return bent portion 94 forms a yieldable support and a better cushioning effect for the front longitudinal edge of the upper layer 113.

Preferably the arched portions 121 of the upper and lower layers 113 and 92 are secured together adjacent the longitudinal median line thereof by adhesive 123, but may be secured together by any other suitable means such as hog rings, clips, staples and the like.

Vertical ooil springs 124 and 125 respectively extend between and are terminally anchored to the transversely extending end members 126 and 127 respectively of the supporting frame 128 and to the lower layer 92 intermediate the front and rear thereof to support the superimposed layers 92 and 113 at opposite ends of the supporting frame.

In FIGURES 14 and 15, l have shown another modiand 122 respectively cation wherein the lower layer 129 is provided at approximately the longitudinal median line thereof with a preformed longitudinally extending vertically disposed substantially S-shaped portion 130, .and the upwardly curved forwardly extending portion 131 of the lower layer 129 is supported by a longitudinally extending upwardly transversely curved or arched booster unit 132.

The rear longitudinally extending border wire 133 of the lower layer 129 is secured throughout its length to the flat inward extension 134 of the rear longitudinally extending member 135 by clips 136 or other suitable means that embrace such border wire 133 and that extend through openings 137 in the extension 134. The lower layer has a portion 138 that curves upwardly from the rear border wire 133 and that connects edgewise into the uppermost side 139 of the S-shaped portion 130. The lowermost side 140 of the S-shaped portion rests upon and is connected by hog rings 141 or other suitable means to the top Wall 142 of a longitudinally extending inverted channel-shaped member 143 that is mounted upon and is secured to the transversely extending end members 144 and 145 respectively of the supporting frame 146 in spaced relation to the front longitudinally extending member 147. The lowermost side 140 of the S-shaped portion 130 connects edgewise into the upwardly curved forwardly extending portion 131 of the lower layer 129, and the latter is provided at its `forward edge with a longitudinally extending border wire 148.

The rear longitudinally extending side 149 of the border frame of the upper layer 150 is anchored throughout its length in longitudinally aligned substantially U-shaped arms 151 that are struck out from and that open toward the inner upright side wall 152 of the rear longitudinally extending member 135. The upper layer 150 is then bent or arched upwardly over the lower layer 129, including the preformed S-shaped portion 130 and the upwardly curved forward portion 131, and then the front longitudinal side 153 of the border frame of the upper layer 150 is secured throughout its length by clips 154 or other suitable means to the front border wire 148- of the upwardly curved forward portion 131 of the lower layer 129.

The longitudinally extending upwardly transversely curved or arched booster unit 132 is located between thc longitudinally extending inverted channel-shaped member 142 and the front longitudinally extending `member 147 of the supporting frame 146, and is provided at opposite longitudinal edges thereof with border wires 155 and 156 respectively which are anchored throughout their length in longitudinally aligned substantially U-shaped arms 157 and 158 respectively that are struck out from and that open toward the opposed sides 159 and 160 respectively of the front longitudinally extending member 147 and of the longitudinally extending inverted channel-shaped member 142. Preferably the upwardly arched booster unit 132 is secured to the upwardly curved forward portion 131 of the lower layer 129 by adhesive 161 or other suitable means. Thus this booster unit 132 will provide a yieldable support and a better cushioning elect for the front longitudinal edge of the upper layer 150.

Preferably the arched portion 162 of the upper layer 150 and the uppermost side 139 of the S-shaped portion 130 of the lower layer 129 are secured together by adhesive 163 adjacent the longitudinal median line of said layers 129 and 150, but may be secured together by any other suitable means, such as hog rings, clips, staples and the like.

Vertical coil springs 164 and 165 respectively extend between and are terminally anchored to the transversely extending end members 144 and 14S respectively of the supporting frame and to the lower layer 129 intermediate the front and rear thereof to support the superimposed layers 129 and 150 at opposite ends of the supporting frame.

The S-shaped portion 130 of the lower layer also serves as a booster for the arched portion 162 of the upper layer 150 to provide such upper layer with a spring support when subjected to compression and to provide a soft cushioning movement for the upper layer. The S- shaped portion 130` of the lower layer 129 also causes the arched portion 162 of the upper layer 150 to return to its original arched position after the latter has been relieved of a load.

What I claim as my invention is:

1. The combination with a supporting frame having laterally spaced longitudinally extending members, of two longitudinally extending spring wire reinforced composite layers arranged in upwardly transversely arched superimposed relation upon said supporting `frame, the lower of said two layers being provided throughout its length at the front thereof with an upwardly projecting inwardly opening preformed open return bent portion, means securing the uppermost side of said open return bent portion to the uppermost of said superimposed layers adjacent the front edge thereof, and means provided along the front of the lower layer and along the rear longitudinal edges of the superimposed layers for anchoring such layers to the laterally spaced longitudinally extending members of said supporting frame.

2. The structure defined by claim l, wherein the upwardly arched superimposed layers are secured together adjacent the longitudinal median lines of said layers.

3. The structure defined in claim 1, wherein the upwardly arched superimposed layers are spaced vertically apart.

4. The combination with a supporting frame, of two longitudinally extending layers arranged in upwardly transversely arched superimposed relation upon said supporting frame, the lower of said two layers being provided throughout its length at the front thereof with an upwardly projecting inwardly opening preformed open return bent portion, means securing the uppermost side of said return bent portion to the uppermost of said superimposed layers adjacent the front edge thereof, and means provided along the `front of the lower layer and along the rear of said superimposed layers for anchoring such layers to said supporting frame.

5. The structure defined in claim 4, wherein the lower of said two layers includes three laterally spaced longitudinally extending strips of fabric, longitudinally extending border wires respectively upon one side of the outermost two of said strips, and longitudinally spaced transversely extending reinforcing wires threaded through said strips and terminally connected to said border wires.

6. The combination with a supporting frame having laterally spaced front and rear longitudinally extending members, of two longitudinally extending layers arranged in upwardly transversely arched superimposed relation upon said supporting frame, the lower of said two layers being provided throughout its length at the front thereof with two preformed open return bent por tions, one of said open return bent portions being upon the inner side of the front longitudinally extending member and opening inwardly, the second of said open return bent portions opening outwardly, the lower side of said second open return bent portion being connected to the outer side of said one open `return bent portion, the inner side of said one open return bent portion being connected to the lower layer, means securing the uppermost side of said second open `return bent portion to the uppermost of said superimposed layers at the front edge thereof, and means provided along the outer side of said one open return bent portion and along the rear of said superimposed layers for anchoring such layers to the laterally spaced longitudinally extending front and rear members of said supporting `frame.

7. The combination with a supporting frame having laterally spaced front and rear longitudinally extending members, of two longitudinally extending layers arranged in upwardly transversely arched superimposed relation upon said supporting frame, the lower of said two layers being provided throughout its length at the front thereof with two preformed open return bent portions, one of said open return bent portions being upon the inner side of the front longitudinally extending member and opening inwardly, the second of said open return bent portions opening inwardly, the lower side of said second open return bent portion being connected to the outer side of said one open return bent portion, the inner side of said one open return bent portion being connected to the lower layer, means securing the uppermost side of said second open return bent portion to the uppermost of said superimposed layers adjacent the front edge thereof, and means provided along the bottom of said one open return bent portion and along the rear of said superimposed layers for anchoring such layers to the laterally spaced longitudinally extending front and rear members of said supporting frame.

8. The structure defined by claim 6, wherein the upwardly arched superimposed layers are secured together adjacent the longitudinal median lines of said layers.

9. The structure defined `by claim 7, wherein the upwardly arched superimposed layers are secured together adjacent the longitudinal median lines of said layers.

l0. The combination with a supporting frame having three laterally spaced longitudinally extending members, of a composite lower layer extending longitudinally of said frame, said lower layer being provided at the longitudinal median line of said frame with a preformed longitudinally extending vertically disposed substantially S-shaped portion and being provided upon the front and rear sides respectively of said S-shaped portion with an upwardly curved forwardly extending portion and a downwardly curved rearwardly extending portion, the uppermost side of said S-shaped portion connecting edgewise into the downwardly curved rearwardly extending portion, the lowermost side of said S-shaped portion connecting edge wise into the upwardly curved forwardly extending portion, said downwardly curved rearwardly extending portion being secured to the rearmost of said longitudinally extending members, the lowermost side of said S-shaped portion being secured to the intermediate of said longitudinally extending members, a longitudinally extending composite upper layer arranged in upwardly transversely arched relation above said composite lower layer and secured to the forward edge of said upwardly curved forwardly extending portion and to the rearmost of said longitudinally extending members. and a booster unit for said upwardly curved forwardly extending portion of said lower layer located between and anchored to the forward and intermediate longitudinally extending members of said supporting frame.

l1. The combination with a supporting frame having three laterally spaced longitudinally extending members, of a composite lower layer extending longitudinally of said frame, said lower layer being provided at the longitudinal median line of said frame with a preformed longitudinally extending vertically disposed substantially S-shaped portion and being provided upon the front and rear sides respectively of said S-shaped portion with an upwardly curved forwardly extending portion and a downwardly curved rearwardly extending portion, the uppermost side of said S-shaped portion connecting edgewise into the downwardly curved rearwardly extending portion, the lowermost side of said S-shaped portion connecting edgewise into the upwardly curved forwardly extending portion, said downwardly curved rearwardly extending portion being secured to the rearmost of said longitudinally extending members, the lowermost side of said S-shaped portion being secured to the intermediate of said longitudinally extending members, a longitudinally extending composite upper layer arranged in upwardly transversely arched relation above said composite lower layer and secured to the forward edge of said upwardly curved forwardly extending portion and to the rearrnost of said longitudinally extending members, and a booster unit for said `upwardly curved forwardly extending portion of said lower layer, including a longitudinally extending upwardly transversely arched spring wire reinforced composite `layer located between and anchored along its opposite longitudinal ledges to the forward and intermediate longitudinally extending members of said supporting frame.

l2. The combination with a supporting frame, of two longitudinally extending layers of fabric larranged in superimposed upwardly transversely arched relation upon said supporting frame and having laterally spaced longitudinally extending border wires, longitudinally spaced reinforcing wires threaded transversely through said fabric layers and terminally connected to said border wires, the lower of said two layers having means including a longitudinally extending preformed open return bent portion secured to the upper of said two layers, and means provided along the front of the lower layer and lalong the rear of said superimposed layers for anchoring such layers to said supporting frame.

13. The combination with a supporting frame, of two longitudinally extending spring wire reinforced composite layers arranged in superimposed relation upon said supporting frame, the upper of said two layers being arranged throughout its length in upwardly transversely arched relation to the lower of said two layers, the lower of said two layers having means including a longitudinally extending preformed open return bent portion projecting upwardly, opening inwardly, and extending throughout the length of said lower layer at the front thereof, the uppermost side of said open return bent portion being secured to the lowermost side of the upper of said two layers adjacent the front edge thereof, and means for anchoring said upper and lower layers to said frame.

14. The combination with a supporting frame, of two longitudinally extending spring wire reinforced composite layers arranged in superimposed relation upon said supporting frame, the upper of said two layers being arranged throughout its length in upwardly transversely arched relation to the lower of said two layers, the lower of said two llayers having means including la longitudinally extending preformed open return bent portion projecting upwardly and located at approximately the longitudinal median line of said lower layer, the uppermost side of said open return bent portion being secured to the upwardly arched upper layer at approximately the longitudinal median line of said upper layer, and means for anchoring said upper and lower layers to said frame.

15. The combination with a supporting frame, of two longitudinally extending spring wire reinforced composite layers arranged in superimposed relation upon said supporting frame, the upper of said two layers being arranged throughout its length in upwardly transversely arched relation to the l-ower of said two layers, the lower 0f said two layers being arranged throughout its length in upwardly transversely arched relation to the upper of said two layers, said upwardly transversely arched layers being secured together adjacent the longitudinal median lines thereof, the lower of said two layers having means including a longitudinally extending preformed open return bent portion secured to the upper of said two layers, and means for anchoring said upper and lower layers to said frame.

16. The combination with a supporting frame, of two longitudinally extending spring wire reinforced composite layers arranged in superimposed relation upon said supporting frame, the upper of said two layers being arranged throughout its length in upwardly transversely arched relation to the lower of said two layers, the lower of said two layers being arranged throughout its length in upwardly transversely arched relation to the upper of said two layers, said upwardly transversely arched layers being spaced vertically apart, the lower of said two layers having means including a longitudinally extending preformed open return bent portion secured to the upper of said ,two layers, and means for anchoring said upper and lower layers to said frame.

17. The combination with a supporting frame, of two longitudinally extending spring wire reinforced composite layers arranged in superimposed relation upon said supporting frame, `the upper of said two layers being arranged throughout its length in upwardly .transversely arched relation to the lower of said two layers, the lower of said two layers having means including a longitudinally extending preformed open return bent portion secured to the upper of said two layers, vertical coil springs extending between and terminally anchored to the lower of said two layers and to said supporting frame at `approximately the longitudinal median line of said frame, and means for ,anchoring said upper land lower layers to said frame.

18. The combination with a supporting frame, of two longitudinally exten-ding spring wire reinforced composite 'layers arranged in superimposed relation upon said supporting frame, the upper of said two layers being substantially coextensive with said frame and arranged throughout its length in upwardly transversely arched relation to fthe lower of said two layers, the lower of said two layers being substantially coextensive with said frame and arranged throughout its length in upwardly transversely *arched relation to said frame, the lower of said two layers being provided at the front thereof with means including a longitudinally extending preformed open return bent portion projecting upwardly and extending throughout the length of the lower of said two layers, the uppermost Side of said open return bent portion being secured to the lowermost side of the upper of said two layers, and means provided at the front of the lower layer and at the rear of said superimposed layers for anchoring such layers to said supporting frame.

19. The combination with a supporting frame having laterally spaced longitudinally extending members, of two longitudinally extending spring wire reinforced layers arranged in upwardly transversely arched superimposed relation upon said supporting frame, the lower of said two layers being provided throughout its length with an upwardly projecting preformed open return bent portion, means securing the uppermost side of said open return bent portion to the uppermost of said superimposed layers, and means provided along the open return bent portion of the lower layer and along the rear longitudinal edges of the superimposed layers for anchoring such layers yto the laterally spaced longitudinally extending members of said supporting frame.

20. The combination with a supporting frame, of two longitudinally extending layers arranged in superimposed upwardly `transversely arched relation upon said supporting frame, having laterally spaced longitudinally extending border wires, and having longitudinally spaced transversely extending reinforcing wires terminally connected to said border wires, the lower of said ytwo layers having means including a longitudinally extending preformed open return bent portion secured to the upper of said two layers, and means provided along the open return bent portion of the lower layer and along the rear of said superimposed layers for anchoring such layers to said supporting frame.

References Cited in the file of this patent UNITED STATES PATENTS UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,091,451 May 28, 1963 Clair S. Reed 1t is hereby certified that error appears in the above numbered pet ent requiring correction and that the said Letters Patent should reed. ne

corrected below.

In the drawings, Sheet 1, in Figs. 1 and 3, for the reference numeral "40", each occurrence, read 37 column 2, line 47, for "11" read 13 column 3, lines 31, 35 and 37, for "40", each occurrence, read 37 column 5, lines 24, 27 and 29, for "99", each occurrence, read 102 same column 5, line 27, for "102" read 99 column lines 46 and 55, for "142", each occurrence, read 143 Signed and sealed this 3rd day of December 1963.

(SEAL) Attest:

ERNEST w. SWIDER EDWIN L. REYNOLDS Attetillg Officer AC Ling (bunnies-'Lome' of i' u; o: 

1. THE COMBINATION WITH A SUPPORTING FRAME HAVING LATERALLY SPACED LONGITUDINALLY EXTENDING MEMBERS, OF TWO LONGITUDINALLY EXTENDING SPRING WIRE REINFORCED COMPOSITE LAYERS ARRANGED IN UPWARDLY TRANSVERSELY ARCHED SUPERIMPOSED RELATION UPON SAID SUPPORTING FRAME, THE LOWER OF SAID TWO LAYERS BEING PROVIDED THROUGHOUT ITS LENGTH AT THE FRONT THEREOF WITH AN UPWARDLY PROJECTING INWARDLY OPENING PREFORMED OPEN RETURN BENT PORTION, MEANS SECURING THE UPPERMOST SIDE OF SAID OPEN RETURN BENT PORTION TO THE UPPERMOST OF SAID SUPERIMPOSED LAYERS ADJACENT THE FRONT EDGE THEREOF, AND MEANS PROVIDED ALONG THE FRONT OF THE LOWER LAYER AND ALONG THE REAR LONGITUDINAL EDGES OF THE SUPERIMPOSED LAYERS FOR ANCHORING SUCH LAYERS TO THE LATERALLY SPACED LONGITUDINALLY EXTENDING MEMBERS OF SAID SUPPORTING FRAME. 